Re: How to hob an enlarged pinion?


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Posted by Ron V on April 28, 2006 at 21:19:27:

In Reply to: How to hob an enlarged pinion? posted by Kevin on April 28, 2006 at 14:45:02:

I'm don't know the machine you're using but if you're using one with a diff then the ratio gears for the diff remain the same but, (you probably already know this) because you need to cut a set of gears which have opposite leads, the diff's rotation needs to be reversed from one gears set up to the other. Introducing an idler into the diff's gear train is the usual practice.

Then of course, the hobberís milling headís angular position needs to be rotated in the opposite direction to the direction it was set up for cutting the first gear and, depending on several factors, the tools helix angle either needs to added or subtracted from the milling head's angular position.

I have no idea what would happen to the set up if you were using a machine without a diff.

In case you need them here are the cutting specs with 0.05mm backlash for each member:

Pinion: O.D. = 15.62, X = 0.5, M2 = 4.92, and the Gear: O.D. = 72.45, X = 0, M8 = 23.18. You might have some trouble measuring across 8 teeth on the gear if it has a narrow face width. Let me know if you need the accross balls/pins dimension you'll need something close to 2mm.




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